java aes加密解密工具类

以下为Java的AES加密解密工具类：

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.util.Base64;

public class AESUtil {

    private static final String ALGORITHM = "AES/CBC/PKCS5Padding";
    private static final String CHARSET = "UTF-8";

    /**
     * 加密
     * @param data 待加密的字符串
     * @param key 密钥
     * @param iv 向量
     * @return 加密后的字符串
     */
    public static String encrypt(String data, String key, String iv) {
        try {
            Cipher cipher = Cipher.getInstance(ALGORITHM);
            SecretKeySpec secretKeySpec = new SecretKeySpec(key.getBytes(), "AES");
            IvParameterSpec ivParameterSpec = new IvParameterSpec(iv.getBytes());
            cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, ivParameterSpec);
            byte[] encrypted = cipher.doFinal(data.getBytes(CHARSET));
            return Base64.getEncoder().encodeToString(encrypted);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 解密
     * @param data 待解密的字符串
     * @param key 密钥
     * @param iv 向量
     * @return 解密后的字符串
     */
    public static String decrypt(String data, String key, String iv) {
        try {
            Cipher cipher = Cipher.getInstance(ALGORITHM);
            SecretKeySpec secretKeySpec = new SecretKeySpec(key.getBytes(), "AES");
            IvParameterSpec ivParameterSpec = new IvParameterSpec(iv.getBytes());
            cipher.init(Cipher.DECRYPT_MODE, secretKeySpec, ivParameterSpec);
            byte[] decrypted = cipher.doFinal(Base64.getDecoder().decode(data));
            return new String(decrypted, CHARSET);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

}

使用示例：

public class Main {

    public static void main(String[] args) {
        String data = "Hello, world!";
        String key = "1234567890123456";
        String iv = "1234567890123456";
        String encrypted = AESUtil.encrypt(data, key, iv);
        String decrypted = AESUtil.decrypt(encrypted, key, iv);
        System.out.println("明文：" + data);
        System.out.println("加密后：" + encrypted);
        System.out.println("解密后：" + decrypted);
    }

}